F - Mech Eng,Light,Heat,Weapons – 16 – K
Patent
F - Mech Eng,Light,Heat,Weapons
16
K
F16K 17/10 (2006.01) F16F 9/34 (2006.01) F16F 9/512 (2006.01) G05D 16/20 (2006.01)
Patent
CA 2123119
2123119 9311370 PCTABS00022 A proportional pressure control valve (10) has a metering spool (42) which selectively meters flow between an axial first port (12) and radial second ports (14). The spool (42) is axially reciprocable with a larger face (40) toward the first port (12) and a smaller face (62) opposite from the first port (12), with a pressure equalization bore (60) through the spool (42). A first spring (64) extends between the smaller face (62) of the spool (42) and an armature (66) and the armature (66) is biased to a normal position by a second spring (74) and also has a pressure equalization bore (72) through it. Radial orifices (70) are formed in the end of the armature (66) facing the smaller face (62) of the spool (42), and the end of the armature (66) seats in the main bore (46) in which the spool (42) is seated. Passageways (90) extend from the orifices (70) to the second ports (14), and two selectively and variably energizable electromagnetic coils (80, 82) coaxially encircle the armature (66), one to draw the armature (66) to one side of the normal position and the other to draw the armature (66) to the opposite side. The normal position of the armature (66) preferably biases the spool (42) to an intermediate setting so that energizing the coil (82) which is toward the closed position of the spool (42) stiffens the response of the valve (10) and energizing the coil (80) which is away from the closed position of the spool (42) softens the response of the valve (10). Energizing one or the other coil (80, 82) also varies the exposed area of the orifices (70) to change the slope of the pressure-flow rate curve (98, 99, 100, 101, 102) at the particular energization level for low flow rates.
Stobbs Thomas J.
Trickle Glen W.
Applied Power Inc.
Goudreau Gage Dubuc
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